On 16 Sep 2004 15:07:15 -0700, firstname.lastname@example.org (Ed Bennett) wrote:
unless you're measuring travel in 2 directions simultaneously on the
cross slide on your metal lathe.
which of course we wouldn't do here. it's not woodworking.....
Well, this is actually a bit different. Here there are two indicators
measuring two different things (x movement and y movement) providing
two different values (x and y) to locate a single object in two
dimensions. The x and y readings are supposed to be completely
independent of eachother (unless your lathe is a bit difficient).
There are times where a "comparator" of sorts will be constructed to
provide differential measurements between an unknown and a fixed
standard. Some of my electronic gaging equipment has inputs for this.
Very complicated. Very expensive. Often a setup like this is used
in the calibration of gage blocks. I tried to do it once and failed
pretty miserably. I just don't have the facilities or capabilities to
eliminate all the variables. You think it's easy until you try it!
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